Dewormers are still the No. 1 weapon for parasite control. But without good pasture management, you may not get the optimum return from that investment.

"I'm very much aware of the buildup of resistance in nematode parasites," said cattle producer and retired animal scientist John Stuedemann, of Comer, Ga. "Our underlying philosophy is to minimize the use of chemical dewormers. We try not to deworm more than twice a year. We also think of the total management system and try to minimize the handling of animals."